What Is the Doomsday Clock — And Why Should You Care?

The Doomsday Clock is a symbol created and maintained by the Bulletin of the Atomic Scientists, a non-profit organization founded in 1945 by Albert Einstein, J. Robert Oppenheimer, and other scientists who worked on the Manhattan Project. Its purpose is brutally simple: it shows how close humanity is to a man-made global catastrophe, measured in symbolic minutes and seconds before "midnight."

Midnight does not mean the end of the planet. It means the end of civilization as we know it — the point at which humanity's own tools (nuclear weapons, climate disruption, disruptive technologies) could tip the world into irreversible collapse.

The Current Setting: 89 Seconds to Midnight

In January 2025, the Bulletin's Science and Security Board moved the clock to 89 seconds to midnight — the closest it has ever been in its 78-year history. That is 1 minute and 29 seconds away from the symbolic end of the world.

The clock is not a prediction. It is not a countdown. It is a scientific judgment, reviewed once per year, of how dangerous the global situation has become. The hands never "tick" in real time — they are moved only when the Board announces a new assessment.

Why It's Not Just About Nuclear War

For decades, the Doomsday Clock tracked only one threat: nuclear annihilation. Since 2007, however, the Bulletin has explicitly factored in climate change, and since 2019 it has warned about cyber-enabled disruption and disruptive technologies (including artificial intelligence and biotechnology). The clock now reflects the combined risk of every existential threat facing civilization at once.

The History of the Doomsday Clock: From 1947 to Today

The Doomsday Clock was born in 1947, in the pages of the Bulletin of the Atomic Scientists — a magazine created two years earlier by scientists who had helped build the atomic bomb and were horrified by what they had unleashed. The artist Martyl Langsdorf (wife of physicist Alexander Langsdorf) designed the first clock face for the June 1947 cover. She chose 7 minutes to midnight because "it looked good to my eye."

The hands have been moved 25 times since then. Each move reflects a new consensus assessment by the Bulletin's Science and Security Board, which includes Nobel Laureates, nuclear physicists, climate scientists, and global policy experts.

The Farthest and the Closest

The clock has never been farther than 17 minutes to midnight (in 1991, after the Soviet Union dissolved and the Cold War ended). It has never been closer than 89 seconds — the current setting, set in January 2025.

Perhaps the most famous moments in the clock's history:

• 1953 — Moved to 2 minutes after the US tested its first hydrogen bomb. The same 2-minute setting as 2018.
• 1962 — The Cuban Missile Crisis did not move the clock. The Board decided not to react to short-term events, only to trends.
• 1991 — 17 minutes: the safest setting ever, after the Cold War ended.
• 2018 — 2 minutes: the closest setting since 1953, driven by nuclear modernization and climate change.
• 2020 — 100 seconds: the first time in history the clock entered the sub-2-minute range.
• 2023 — 90 seconds, driven primarily by the war in Ukraine.
• 2025 — 89 seconds: a new record. The world has never been closer to midnight.

Why 89 Seconds? The 2025 Warning Explained

When the Bulletin of the Atomic Scientists announced the 89-second setting on January 28, 2025, the message was blunt: "The world has not made sufficient progress on the existential risks we identified a year ago, and in several cases the situation has worsened."

The Board cited four interlocking threats:

1. Nuclear Risk

The war in Ukraine has continued, with the ever-present risk that the conflict could cross a nuclear threshold. The erosion of arms-control treaties (New START, the INF Treaty, the Open Skies Treaty) has removed guardrails that kept the Cold War stable. Major powers are modernizing their arsenals and developing hypersonic delivery systems, adding new dimensions to an already fragile system.

2. Climate Change

2024 was the first calendar year in which the global average temperature exceeded 1.5 °C above pre-industrial levels — a symbolic threshold scientists had long hoped to avoid. Extreme weather events are becoming more frequent and costly. The Board warns that the climate trajectory is now incompatible with the stability of modern civilization.

3. Disruptive Technologies (AI & Bio)

The rapid, largely unregulated deployment of generative artificial intelligence has introduced risks — from disinformation campaigns to the potential for AI-assisted bioengineering — that no existing global governance framework is prepared to manage. The Board explicitly called for stronger international cooperation on AI safety.

4. Geopolitical Instability

Global governance is weakening. The UN Security Council is paralyzed by great-power competition. Multilateral institutions designed to reduce risk — from the IAEA to the WHO — are underfunded and increasingly politicized. The Board's verdict: the international system is failing at the very moment when its tools are most needed.

Bottom line: the move from 90 seconds to 89 seconds is technically tiny — but symbolically massive. The Board does not move the hands for drama. It moves them because the facts demand it.

Every Doomsday Clock Setting Since 1947

Here is the complete record of every official change to the Doomsday Clock — 25 moves in 78 years.

Doomsday Clock: Frequently Asked Questions